Suggest Treatment For Severe Arm Pain

Hi Doctor I am a 52 yeas old male, since I remember when I was young in my 20 s I have always felt my arms in some kind of pain not that much but some pain and my arms are like they are tired, I lift some easy dumbels (20 pounds) easily but I can t do many repetitions at the 3rd or 4 repetition my arms (biceps/triceps) are super tired same thing if I do push ups? after the 3rd or 4th push-up my arms are tired Same thing happens with my legs, if I ride my mountain bike on the street on my way there is a little heel I feel my legs tired? because of this I have rested one or two week believing this pain or kind of tiredness will pass but when I get back to do same thing, I feel the same way? I eat healthy I don t eat candies donnuts however I eat a lot of bread every day, I eat fruits no soda, I even drink Emergency every single day